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    Silicon Sea: Leg 83
    From: Dan Hogan
    Date: 2002 Sep 19, 08:00 -0700

    Chart(s): Plotting Sheets
    Sight Reduction and
    Dead-Reckoning problem     Leg 83  091902   Test your knowledge!
    ----------------------     ------  ------   --------------------
    We are bound for a Hawaii landfall waypoint at(19d 30.0'N  154d 45.0'W).
    We had a RUNNING FIX on 16/07/2001 @ 01:44:36UT(18d 37.2'N  152d 13.6'W).
    The highest point on the island of Hawaii that should be visible to us is
    the Mauna Loa Volcano (19d 30.0'N  155d 36.0'W) at a height of 4169 meters.
    1)  At what distance should the Silicon Sea navigator expect to be able to
        see the top of Mauna Loa(19d 30.0'N  155d 36.0'W) on the horizon?
    --  ----------------------------------------------------------------------
    Var 10dE Dev 1.0dE. Speed 10 Kts, Current Set 095d, Drift 0.7 Kts.
    2)  What is the Compass Course(CC)/Course-to-Steer toward Mauna Loa, at
        (19d 30.0'N  155d 36.0'W) from our RUNNING FIX(18d 37.2'N  152d 13.6'W)?
    --  ------------------------------------------------------------------------
    3)  What Time Zone are we in?
    --  -------------------------
    Since our RUNNING FIX 16/07/2001 @ 01:44:36UT(18d 37.2'N  152d 13.6'W), we
    have run an elapsed distance of 140 Nmi on a TC 290.0d. At this time we
    sight Cape Kumukahi(19d 30.0'N  154d 45.6'W), which we must round to head
    >for Hilo, Hawaii, our port of entry. Speed 10 Kts.
    4)  What is our DR position at our 140 Nmi point?
    --  ---------------------------------------------
    >Use 19d 30.0N'N  154d 41.6'W for the Distance Off calculation to clear
    Cape Kumukahi by 4 Nmi abeam. Speed 10.0 Kts, Var 10dE Dev 1.0dE. Current
    Drift 0.4 Kts Set 270d.
    >5)  What is the Compass Course (CC) we must steer from our DR position?
    --   -------------------------------------------------------------------
    Our port of entry will be at Hilo, Hawaii (19d 44.0'N 155d 04.0'W).
    >6)  What is the distance from Cape Kumukahi D.O. Point(19d 30.0N'N
         154d 41.6'W) to the entry point(19d 44.0'N 155d 04.0'W) at Hilo ?
    --  ------------------------------------------------------------------
    7)  What is the Zone Time(ZT) ETA at the Hilo entry point?
    --  ------------------------------------------------------
    Lat & Lo = XXd XX.X', Date=DD/MM/YY, HE 9 Feet, Index correction
    -2.5', Time hh:mm:ss in UT,unless otherwise stated. Silicon
    Sea II is a 34,000 lb(15.40t) displacement sailing vessel, 48' 3"
    (14.70m) LOA. 39' (12.00m) LWL; Cutter rigged. Can tack to 45d.
    Water Tanks = 220 gal(1000 ltrs). Fuel Tanks = 155 gal(700 ltrs).
    Fuel consumption .675 gal/Hr at 8.5 Kts. DR(Ded-Reckoning)=position
    by sailings, EP(Estimated Position)=DR+current affect. Dist to
    Horizon: Nmi = SQRT HE@mtrs x 2.07; Nmi = SQRT HE@ft x 1.17.
    PLEASE respond with your results and thinking on these exercises to
    the NAVIGATION list at large. If you have questions or problems, A
    lot of folks on the list are knowledgeable and willing to help. Any
    questions or doubtful areas will be responded to promptly. Let us
    hear from you soon!
    Good Navigating!
       -=The Navigation List Working Group=-
            Peter Smith -  Smith_Peter@emc.com
            Mike Wescott - wescott_mike@emc.com
            Dave Weilacher - daveweilacher@earthlink.net
            Tony Capiello - anthony.cappiello@baesystems.com
            Richard Berkowitz - richdberko@aol.com
            Dan Hogan - dhhogan1@earthlink.net
    Dan Hogan WA6PBY
    C27 "Gacha"
    Nav-L Page: http://www.wa6pby.com

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